With enough capital, investing in Bitcoin and Ethereum, I think, should be the first thing to do.

As for the other altcoins, the choice of coin also depends on your investment strategy and the capital you have. Some coins are suitable for long-term investments, there are some in which you can invest in a shorter time, etc.
I personally prefer long-term investments and I think some of these coins are appropriate:
- Cardano
- Polygon
- EXMO
- Futurov